Have you gotten an answer to this yet? I looked down and noticed I somehow turned the feature on but then when I tried to figure out how I did it, the clock and weather were gone. I can't figure out how to get it back.

I ended up buying the "Beautiful Widgets" app. It costs about $1.40 (.99 Euros). I am very happy with it and the dev is great with updating. He's made several updates to optimize it for the Droid already.

Whatever this is already exists on the phone. Like I said...I apparently hit something yesteday and the clock popped up and it said it was looking for my location for the weather report. Before it fully loaded I hit the Home button and then the screen cleared.